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(6) Wear and looseness of the socket
With extended use, the hexagonal portion of the socket which is fitted to the head of the bolt or drill bit, and/or
hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will become worn and
loose. Wear and looseness will cause a proportionate loss of tightening torque.
In addition, use of an incorrect size socket (slightly larger than the bolt being tightened) will also result in
decreased torque.
(7) Bolt and nut rotate together
Tightening torque that can be achieved will be considerably decreased if the bolt and nut rotate together
during the tightening operation. The customer should be advised to carefully observe the operation and
ensure this does not occur.
7-4. Suggestions and precautions for the Efficient Use of the Charger
(1) Batteries may not be rechargeable immediately after use
If the Type EB 9B or EB 9H Storage Batteries are exposed to direct sunshine for an extended period, or if the
temperature of the batteries is 40 ˚C (104 ˚F) or higher immediately after they have been used in the tool, the
pilot lamp may not light up when the batteries are connected to the Model UC 14YF2 Charger. This is
because the built-in thermostat functions to stop the charging when the temperature of the storage batteries
reach 40 ˚C (104 ˚F) or more. In such a case, the customer should be advised to place the batteries in a
shaded area with a good airflow, and allow sufficient cooling before recharging.
This phenomenon is common to all existing batteries which employ temperature sensitive overcharge devices.
The cooling time required before charging can be accomplished varies from a few minutes to about 30
minutes, depending on the load, duration of use, and ambient temperatures.
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